AutoFilter.h

#ifndef AUTOFILTER_H
#define AUTOFILTER_H

#include <Arduino.h>
#include <math.h>

class AutoFilter {
public:
    // Constructor
    AutoFilter();

    // Modulation Methods
    float amplitudeModulation(float carrier, float signal);
    float frequencyModulation(float carrier, float modulator, float sensitivity);
    float phaseModulation(float carrier, float modulator, float sensitivity);
    float quadratureAmplitudeModulation(float iSignal, float qSignal, float carrier);

    // PWM
    // void pulseWidthModulation(int pin, float dutyCycle, int frequency);
    void pulseWidthModulation(int pin, float dutyCycle, int pwmFrequency);
    void dualPulseWidthModulation(int pin1, int pin2, float dutyCycle, int frequency, int phaseShift);

    // Filtering Methods
    float lowPassFilter(float currentInput, float prevOutput, float alpha);
    float highPassFilter(float currentInput, float prevInput, float prevOutput, float alpha);
    float movingAverageFilter(float input, float *buffer, int bufferSize, int &index);
    float exponentialMovingAverage(float currentInput, float prevOutput, float alpha);
    float kalmanFilter(float currentMeasurement, float &prevEstimate, float &errorCovariance, float processNoise, float measurementNoise);

    // Utility Functions
    float normalize(float input, float inputMin, float inputMax, float outputMin, float outputMax);

    // Fourier Transform (basic DFT)
    void discreteFourierTransform(float *input, float *outputReal, float *outputImag, int size);

private:
    // Internal variables for PWM and filters
    int pwmPin;
    int pwmFrequency;
};

#endif